单井控制饱和凝析气藏衰竭开发动态预测

根据地下烃组分和水组分摩尔数守恒,按达西定律,考虑重力、毛管力以及界面张力的影响,也考虑地层岩石和地层水的微可压缩性以及储层岩石各向异性和非均质性;利用平衡常数理论划分拟组分,结合拟组分相平衡计算原理,建立了一个多组分三相二维单井渗流数学模型.采用IMPES方法对所建立的数学模型进行差分得相应的数值模型;采用牛顿迭代法将非线性方程线性化,再用线松弛法和直接解法对差分方程组进行求解.用FORTRAN语言编制计算程序.将研究结果用于单井控制饱和凝析气藏模拟计算,着重评价了采气速度对饱和型凝析气藏稳产年限和采出程度等开发动态的影响,从而为单井控制饱和凝析气藏开发方案优选,气井合理生产制度调整提供了依据.

Depletion Exploitation Performance Prediction for the Saturation Conditions Gas- Condensate Reservoir Controlled by Single-Well

According to the mole conservation on the water and the hydrocarbon components in reservoir, adopting the K-value theory of pseudo-component division ,integrating Darcy's law and the method of the pseudo-component phase equilibrium calculation, the two-dimension three-phase single-well compositional mathematical model was presented. The effects of gravity, capillary pressure and interfacial tension, the compressibility of water and rock, the heterogeneity and anisotropy of rock physical properties , were considered. The difference equation for the mathematical model was accomplished by using the way of implicit pressure and explicit saturation (IMPES). The nonlinear equation was linearized by adopting Newton iteration method. The answer of the difference equation group was solved by utilizing linear taxation method and direct solving method. A set of FORTRAN calculation program was written. The result of study was used for the simulation calculation of the saturated conditions condensate gas reservoir controlled by single-well. It put emphasis on evaluating produced gas velocity affects development performance of stable production fixed number of years and produced degree for the saturation conditions gas condensate reservoir. It provided the foundation for development plan optimization of the saturation conditions gas condensate reservoir and gas well reasonable produce system regulation.